Another set of spotting agents distributed by Spencer Systems is the Prenett product line. Spencer Systems offers Prenett CS, Prenett A,B,C, Prenett K4, and Prenett Max.

Prenett products are pre-brushing agents that serve as removers of general dirt. They are optimized for appropriate solvent and are commonly used with brush directly in the dirty textile. Prespotting happens if the textile is applied with a brush prior to the basic cleaning while the stain removal process of postspotting occurs if the textiles are treated only after the basic cleaning.